Precisely when
If and only if
If and only if
-1
Section::::Abstract.
If and only if
14922
If, and only if
Only if
Just in case (catachresis)
Iff
Iff
-1
Section::::More general usage.

If and only if
14922
Material equivalence
↔
↔
-1
Section::::Usage.:Notation.

If and only if
14922
If & only if
⇔
⇔
-1
Section::::Usage.:Notation.

If and only if
14922
Bi-implication
All and only
Materially equivalent
bi implication
iff
material equivalence
just in case catachresis
all and only
precisely when
only if
if only if
if and only if
materially equivalent